"You have to promise you'll be careful, okay? There's a lot of things that can go wrong underwater, baby," Freminet says gently but firmly.

For months now you've been begging for Freminet to take you diving with him. Finally he's obliging but it's making him extra anxious that you're regressing right now while you're about to be underwater for a while.

It's rather obvious Freminet isn't going to let out of his sight while you're both underwater. Even if you do promise to be careful he doesn't trust that you'll remember the precautions while little.